function one(){
  return '我是老大';
}
function two(){
  return new Promise((res,rej)=>{
    
    setTimeout(()=>{
      res('我是老二')
    console.log('我是老二3');
    },100)
  })
}
function three(){
  return '我是老三';
}
function run(){
  console.log(one());  
  console.log(two())
  console.log(three());
}
run()

// console.log(run());
